Dredging machine



2 Sheets-Sheet 1.

DREDGING MACHINE.

@No Model.)

Patented Oct. 30, 1883.

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(No Model.) A 000K 2Sheets--Sheet 2.

DREDGING MACHINE.

N0.'28'7,631. I Patented Oct. 30, 1883.

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UNITED STATES PATE T ()FFICEQ AUGUSTINE COOK, or SALISBURY, MARYLAND.

DREDGlNG-MACHlNE SPECIFICATION forming part of Letters Patent No. 287,631, dated October 30, 1883'.

l Application filed May 29, 1883. (No model.)

To all whom it may concern:

pivoting the standard B being to give the ap- Be it known that I, AUGUSTINE COQK, acitiparatus greater or less range of operation by zen of the United States, residing at Salisbury, in the county of Wicomico and State of Maryland, have invented certain new and useful Improvements in Dredging-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates. to certain improvements in dredging-machines; and it has for its objects to provide a compact and efficient machine which maybe employed to dredge to any practicabledepth, either upon a flat or slopillustrated in the accompanying drawings, in

which- V Figure 1 represents a side elevation of my improved machine; Fig. 2, a partial plan view,

- and Fig. 3 a detached side elevation, enlarged,

showing a portion of the machine. I

The letter A in dicates the bed of the machine, which at suitable intervals is provided with anti-frictionrollers B,mounted in bearings G.

- Theletter D indicates a rotating table mounted upon the said'rollers, and centered So as to rotate upon the bed. A portion. of the periphery is provided with a cogged section, E, which intergears a cogged drivingpinion, F.

The letter Gindicates a circular bed secured to the rotating table above mentioned at one side of the same. The said bed is provided with rollers H, suitably journaled, and upon workinggcar of the said rollers is mounted a rotating table, I, which at its periphery is provided with cog-teeth, as indicated in the. drawings, with which inter-; mesh the teeth of a cog-pinion, K, by means of which said table may be rotated. To the for .ward upper edge of said table is pivoted in suitable bearings, L, the'lower end of the derrick-frame M. The upper end of said frame nected with the standard]? by means of a brace,

Q, The standard P serves to hold the standard R by means of the brace Q, the object of suitable links, or, to the edge of the bucket 12 of the dredge. The said bucket is located at the forward end of a beam, Z,which is arranged'to slide in a sheet-metal box, A, pivoted to the shaft B of a cog-pinion, ,0, the said shaft being journaled in pillow-blocks D, Secured to Thebeamis prothe rear of the crane-frame. vided on its under side with a'rack, E,wh1ch intermeshes with the pinion O, and operates in connection therewith, as more fully hereina after specified. Y a e The elevating-chain passes under a groovepulley, F, the shaft of which is journaled in pillow-blocks G, Secured to the upper rotary table, and then backward between the horizon-- 'tal groove-pulleys H, whichhave their shafts journaled in bearings I on the upper rotary table above mentioned,

The letter K indicates two grooved pulleys horizontallylocatedon the lower rotarytable, the shafts of which are journaled in bearings secured thereto in such manner that as the tables are shifted the chain will pass around one or the other, so as to permit it to work with freedom.

The chainis connected to any suitable drum, by which it. may be wound and un-' The dredging mechanism may be turned so as to work upon either side of the machine by rotating the lower table by means of the gearing provided therefor, and when in position may be moved to a more limited extent,so as to be adjusted laterally to the work by partially rotating the upper table, the connections at the top of the frames permitting the same and their IOO supporting-tables to turn freely independently of each other. The excavating-bar is operated by the system of chains, as shown, to insert the bucket in the soil and elevate it, as indicated in Fig. 1 of the drawings.

I am aware that dredging machines and excavators have been constructed having double rotating tables and suitable elevating mechanism, and this I do not desire to claim, broadly.

Having thus described my invention,what I claim, and desire to secure by Letters Patent,

1. The combination,iu adredging-maehine, of the two rotating tables, the derrick-frame and its pulleys mounted thereon, the rack-bar and pinion, and the chain and gearing, all arranged to operate substantiallyin the manner and for the purposes specified.

2. The combination,with the upper and lower tables, of the upright standard secured to the same, respectively, and connected by alink at their tops, and the derrick-frame connected to the same by a bar or rod, substantially as and for the purposes specified.

3. The combination,in a dredging-machine, 2 5 of the upper and lower rotar tables, the derrick-frame pivoted to the upper table, the grooved rollers mounted at its upper end, the

'raek bar and pinion, the elevating-chain, and

the grooved pulleys mounted onthe rotating ta- 3o bles, respectively, substantially as and for the purpose specified.

4. The combination,in adredging-machine, with the upper and lower tables of the c011- nected standards, the derrick, and gearing for 3 5 operating the same, the grooved horizontal pulleys having their shafts mounted in suitable bearings on the respective tables, and the elevating-chain, all arranged to operate substantially in the manner specified. 40

In testimony whereof I affiX my signature in presence of two witnesses.

AUGUSTINE COOK.

\Vitncsses:

J. G. BELL, JNO. 1. OWENS. 

